The process of element uptake by plants is complex and not totally understood. Some generally known points are:
• The process is not the same for all plants nor for all elements
• The complete process occurs within a healthy root system adequately supplied with carbohydrates and oxygen
• The essential elements must be in an available form in the root zone in balanced amounts
• Uptake varies from element to element and from crop to crop (see table 6-6)
• Soil conditions, such as temperature, moisture supply, soil reaction, soil air composition, and soil structure, affect the rate at which elements are taken up
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